diff --git a/ChangeLog b/ChangeLog
index bda3de8..5575678 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,6 +6,11 @@
    * Fixes an issue with MBEDTLS_CHACHAPOLY_C which would not compile if
      MBEDTLS_ARC4_C and MBEDTLS_CIPHER_NULL_CIPHER weren't also defined. #1890
 
+Changes
+   * Add warnings to the documentation of the HKDF module to reduce the risk
+     of misusing the mbedtls_hkdf_extract() and mbedtls_hkdf_expand()
+     functions. Fixes #1775. Reported by Brian J. Murray.
+
 = mbed TLS 2.12.0 branch released 2018-07-25
 
 Security